First Off don't tell me search because i did and sooooo many of the threads are idiots fighting back and forth and calling each other noobs.

First off, the block.

How strong is the stock block?

What Material is it made out of?

how much whp can it handel before fear of throwing a rod? 200-250whp?

Second, my goal is to have 240-250 whp in this h23 without rebuilding

Third, where did you guys find parts for an h23 turbo project? links and phone numbers woould be great.

how good is the transmission on the h23. I know the longer gears are going to be great for turboing but how is the stock clutch going to hold up with the new found power. Should i be investing in a new one? I can see this as a yes but i am just double checking.

fourth, how expensive will piecing together a proper kit cost

eg

Colder plugs
fuel pump
bigger injectors (will 450cc be enough?)
bov
wastegate
intercooler
turbo (which turbo can spool the quickest to 250whp?)
mainfold
hondata/tuning

what about ecu's? is the stock one fine.

Some serious answers and no bickering would be great because the more information that is usefull in this thread means there is one more thread in the search that will be helpful to others. thanks

 

https://honda-tech.com/zerothread?id=1962402

 

-The stock block is stronger than the stock B/D series blocks. The ringlands on the pistons are main weak points of the block.

-The sleeves are made of FRM (Fiber-reinforced metal)

-You need to do a few tests:

Leak-Down Test
Compression Test

Those two will give you a better idea on the condition of your motor.

-250whp isn't too much for a stock H23, so you should be fine.

The transmission has longer gears, which is good for boost. Anyone will recommend you to change the clutch for one that can handle more torque. ACT, Action, etc.

The cost of your project will depend on the parts you get. You can get a pre-made kit for about $1,500 and that will give you the 250 whp you want.

You can use the stock ecu if you get a piggy-back, but I recommend geting a stand alone like Hondata, Crome, Uberdata, etc. which also means you will need a p28 or p72 ECU.

The Prelude Turbo Thread
https://honda-tech.com/zerothread?id=316373

Great place to start

 

thank you for your response. i would definitely be buying a hondata. i would want to crank out my goal as safely as possible without cutting any corners. the part i was unsure was the ecu. you said p28 p72? how much do those ecu's go for normally.

what about the injectors? is 450cc good for 250whp?

you said the pistons are what i need to worry about and ringlands. if i buy new ones im going to have to have it resleeved wont I?

Does anybody here have a 250whp h23 with stock internals? Someone who does could you leave some feedback on your experience please.

Compression and a leak down are a must for any car before buying it anyway.

 

You definatly didnt search to hard if you couldnt answer this question.
"What Material is it made out of?"

 

so reading that thread the h23 is just an overall better engine to boost for that power goal. the longer gear ratios of the tranny help keep you in boost for longer and the fact that the compression ratio is lower is also better correct?

94draglude - like i said please dont get this tread started with crap. if you dont want to help me out please dont say anything

DfwBB6- thanks for the helpful thread

the main reason i started this one is because its focused around 250whp not a number that has not been decided

 

if i buy new ones im going to have to have it resleeved wont I?
This question is very easy to get an answer on.

 

I am helping you im telling you that if you search on some of this you wont have people annoyed by the same topic posted over and over

 

the main reason i started this one is because its focused around 250whp not a number that has not been decided

 

DSM 450cc Injectors will work for you.

The ringlands aren't a major concern for you, since your whp goal isn't too high.

A p28 ecu goes for approx $100-$120
A p72 ecu goes for approx >$140

 

a walbro 255 fuel pump will work fine on this as well?

Am i going to need a new fuel rail or is the stock one going to be fine? Pressure regulator in this case or still considered useless at this power level?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Prudz_lude &raquo;</TD></TR><TR><TD CLASS="quote">a walbro 255 fuel pump will work fine on this as well?

</TD></TR></TABLE>

Correct.

The stock fuel rail is good up to 400whp, so no need.

 

Still curious about the turbo. which one will spool the quickest and allow me to reach the 250whp goal. i have no clue when it comes to the acutal turbo. i know i dont want something massive that will take half an hour to spool.

 

How strong is the stock block? Blocks have seen over 350hp and were fine for so long

What Material is it made out of? FRM

how much whp can it handel before fear of throwing a rod? 200-250whp? Again blocks have seen over 350 hp which your wanting 250hp you will be fine on your rod.

Second, my goal is to have 240-250 whp in this h23 without rebuilding. Common sense. If your block has over 100k it might be smart to change your valve seals rings, check your compression, replace worn out ignition parts etc

Third, where did you guys find parts for an h23 turbo project? links and phone numbers woould be great. There are many links on this website for this info. Start with ebay if you want to 1/2 *** it.

how good is the transmission on the h23. I know the longer gears are going to be great for turboing but how is the stock clutch going to hold up with the new found power. Should i be investing in a new one? I can see this as a yes but i am just double checking.Your clutch is going to most likley be worn out if you have higher milage and it hasnt been changed. Stock is usually not the way to go....

fourth, how expensive will piecing together a proper kit cost.. Again you can 1/2 *** it for under 1k do it right for $2500 or more.

eg

Colder plugs
fuel pump
bigger injectors (will 450cc be enough?) YES FOR 250 hp
bov
wastegate
intercooler
turbo (which turbo can spool the quickest to 250whp?) You need to read up on Turbo efficiency or just read up on turbos kits in general.
mainfold
hondata/tuning

what about ecu's? is the stock one fine. How do you plan on tuning this turbo motor without an aftermarket ecu. Your motor wont really stand a chance on an untuned motor so No the stock wont work for you.

 

to be honest nothing has been posted here thats new from all the searches that came up on this topic i dont get it

 

This link will teach you what you need to know .
https://honda-tech.com/zerothread/1024174

 

well i know the motor is going to have over 100k so some advice on what i should do would be nice. How much would replacing the gaskets, seals etc cost. what exactly on the engine would need to be replaced just as a standard?

What i am getting so far is im not going to be throwing a rod and my ringlands will be fine. if the compression is great and the leak down is great than shouldn't my h23 be ready for turbo?

Also 1k for a half *** job is just stupid. i will definitely be piecing together a kit that will last and if it only cost 2500 then that is worth it imo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DfwBB6 &raquo;</TD></TR><TR><TD CLASS="quote">to be honest nothing has been posted here thats new from all the searches that came up on this topic i dont get it </TD></TR></TABLE>

Agreed.

 

that last link looks really helpful. thank you

 

even if it has been posted before was it really that hard to help me out with this thread? This site is starting to get a rep for alot of people being really crabby all the time.

i understand the threads like "Can i coat the inside of my headers with axle grease to get power?" the op should be rediculed for posting such a rediculous question, but for relevant questions being told SEARCH everytime makes this place seem extremely unfriendly to alot of people. This is a forum, and the second it turns into an archive it defeats the purpose of the forum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Prudz_lude &raquo;</TD></TR><TR><TD CLASS="quote">well i know the motor is going to have over 100k so some advice on what i should do would be nice. How much would replacing the gaskets, seals etc cost. what exactly on the engine would need to be replaced just as a standard?

What i am getting so far is im not going to be throwing a rod and my ringlands will be fine. if the compression is great and the leak down is great than shouldn't my h23 be ready for turbo?

Also 1k for a half *** job is just stupid. i will definitely be piecing together a kit that will last and if it only cost 2500 then that is worth it imo.</TD></TR></TABLE>
Until you check your motor you dont really know what you need to replace. if you are going to do it right then pull the motor replace your bearings $200, Headgasket $100, Pistons rings dont remember a price, Oil pump, $180, Water Pump $100 Rear main seal, Valve seals $50, Intake mani gasket, Oil pan gakset.
Do you know how to get oil to and from your turbo?
you need a downpipe made if your piecing a turbo kit together.
you need Intercooler piping made for you if you dont get a kit.
There is alot of work involved in piecing a kit together than jsut buying a kit already prefabbed for your setup.

 

i am well aware of the work that needs to be put into installing a turbo. This is exactly why i started this thread. its better to ask questions then do it half assed and be another noob with no clue.

I already knew i have to have a custom down pipe made to fit.

I have not bought the h23 yet which is why i am asking now. Ask before you buy is what i have been taught. If all that maintance is recommended then i will do that if it ensures i don't destroy the engine. i will have about 4000 dollars to play with.

 

Your engine can still get destroyed. You need to put alot of time and money into tuning your engine. it can last a long time or it can grenade very soon. Just make sure you do alot of reading of past expierences and do's and donts. You can find alot of useful info on this site that will help you achieve your goals.

 

If you have extra money while your motor is apart then put some money into your internals. You could buy some Mahle Gold series forged pistons (yes they are compatable with FRM liners) if they make them in low compression not sure, and some eagle rods and give you alot better hopes for a longer lasting motor.

 

i and im sure a few other people are still not convinced that those are good with frm. they might work but you would have to make sure that you have a good motor builder put them in. the clearences have to be perfect.